By spoiling it, he may have meant for instance

[Mary Naeem]

Pope Shenouda III



By spoiling it, he may have meant, for instance, that you add something to it to alter its taste.
At least, do not eat all that is offered to you of the kind of food you crave. As one of the fathers said: "Conclude your meal while you still crave it", meaning that your body wishes to go on eating that kind of food while you try to control yourself and stay away from it.